YOUNGSTOWN: A fifth minor earthquake has been recorded in an area of northeastern Ohio where state regulators have ordered a gas drilling company to halt operations.

The U.S. Geological Survey reported a 2.1 magnitude earthquake early Tuesday morning, about nine miles southeast of Youngstown. That same area experienced four minor earthquakes Monday.

The Ohio Department of Natural Resources has said there’s nothing indicating that the earthquakes are connected to any injection wells. The department on Monday asked the only oil and gas operator in the area to stop all work until it can test further.

An injection well used to hold wastewater from the fracking process has been tied in recent years to a series of earthquakes in the Youngstown area.